On Fri, 8 Dec 2006 10:16:45 -0600, John Benik <[EMAIL PROTECTED]> wrote:
>The reserve that's done in the morning is usually fine, GRS is functioning >as it should. It's also an expected situation. I'm not sure if >converting to an enqueue would do anything for us, but please tell me any >benefits. I will also see if we have other jobs running that are doing >something with the dasd at that time. You already said the backup step runs 2-3 minutes... and the reserve during that time frame is expected. But why 45 minutes prior? ExLM syncing with your tape mgmt software takes a lot of time but I thought it didn't hold the reserve for any long period of time during that process. What exactly are the steps prior to the CDS backup doing in that job? The benefit of a global ENQ over RESERVE are the same as converting any other reserve. It won't lock up an entire volume. If you aren't sharing the CDS volumes with other data sets (which you didn't say yet if you were or weren't), then there is no clear benefit other than the elimination of the start pending messages perhaps. But converting the RESERVE to a global ENQ in a GRS STAR configuration can perform better than letting the RESERVE take place. YMMV. I've never done it with the HSC CDS because we share the CDS across sysplex boundaries. FWIW... we do see start pending messages during our CDS backup because virtual tape is always in use. The job that backs it up is in a "hot batch" WLM service class so it can get into and out of the system as quickly as possible. The operators have learned to ignore those messages at the time(s) of day we backup the CDS. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - GITO mailto:[EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
